Abstract
The interaction noise caused by the periodic impingement of the forward blade wake on the backward blade widely exists in underwater rotating machinery. The rod-hydrofoil configuration is a model problem for interaction noise. Based on our in-house code of lattice Boltzmann method (LBM) solver accelerated by graphics processing unit (GPU), a direct numerical simulation (DNS) of rod-hydrofoil configuration with angles of attack (AoA) from 0° to 30° is carried out in the present work to study acoustic characteristics of the rod-hydrofoil configuration. The results show that GPU-accelerated LBM solver can achieve a DNS of hydrodynamics and acoustics in a short time and obtain the characteristics of the global noise field of rod-hydrofoil configuration accurately and efficiently. With the increase of AoA, the compound vortex structure of the rod-hydrofoil configuration changes greatly, and the hydrodynamic and acoustics characteristics also fluctuate greatly. When AoA <15°, the pure tonal noise caused by Karmen vortex street plays a dominant role. When AoA >15°, the effect of wake noise caused by the shedding of compound vortex structure in the wake region of hydrofoil becomes strong.
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